名词
中文翻译：索引
同义词：
['index card', "index block例句：1. The index is a key to the book's contents.（索引是书内容的关键。）2. She used an index chuck to find her way through the crowd.（她用一个索引卡在人群中找到了自己的位置。）3. The index chuck was used to mark the page where the information was located.（索引卡被用来标记信息所在页面。）"]
例句：
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1. The index is a key to the book's contents.
索引是书内容的关键。
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2. She used an index chuck to find her way through the crowd.
她用一个索引卡在人群中找到了自己的位置。
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3. The index chuck was used to mark the page where the information was located.
索引卡被用来标记信息所在页面。